Welcome to the NEA FEP Database!

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Background and objective

The NEA FEP Database is an electronic tool which supports national programmes for radioactive waste management (RWM) in the identification, classification and screening of features, events and processes (FEPs). These are used when defining relevant scenarios for safety assessment for deep geological repositories (DGRs). The NEA FEP Database is composed of two parts:

  • International FEP (IFEP) List – a comprehensive and structured generic list of factors relevant to the assessment of the long-term safety of DGRs, developed by the NEA Integration Group for the Safety Case (IGSC). IGSC intends to maintain and update the IFEP List in future to reflect developments in safety assessment and its methodologies.
  • Project-specific FEP (PFEP) Lists – collections of FEP lists, with references, that have been developed by radioactive waste management organisations (RWMOs) as part of their safety assessments. Every FEP of each RWMO's PFEP List can be mapped to one or more of the international FEPs within the database to demonstrate consistency. Organisations who would like to add their list to the database should contact the NEA Secretariat.

In 2018 NEA launched a new web-based platform for the NEA FEP Database, accessible from this webpage. This new database has been designed to allow full version control of all lists and is intended to provide a home for all releases of the NEA IFEP List in future. Moreover, it has been designed to allow RWMOs to upload and manage their own PFEP Lists.

Past versions of the NEA FEP Database were implemented in a commercial standalone software package with custom tools to assist in locating and examining FEPs and related information. Several versions were produced, and included FEP lists from different types of repository project for different kinds of waste. The versions that were publically released are:

  • NEA2000 – This included the first public version of the IFEP List (i.e. IFEP List 1.0) and 8 PFEP Lists (download); and
  • NEA2006 – This included the IFEP List 1.0 and 11 PFEP Lists (download).

History of the IGSC FEP Project

The NEA has carried out activities related to the compilation and use of lists and databases of FEPs in safety and performance assessment studies of radioactive waste disposal facilities since the early 1990s. In 2000 NEA released a report containing the first public version of the IFEP List (i.e. IFEP List 1.0) together with the NEA2000 software. This was superseded by the NEA2006 software six years later.

In 2010, NEA launched a questionnaire on “the use of FEPs in performance assessment studies and the scope for related NEA Integration Group for Safety Group (IGSC) activities”. In light of the questionnaire findings, the NEA supported a revision of the FEP Project, intended to ensure it remained useful and relevant to the work of member states. This revision included the:

  • review and update of the IFEP List 1.0; and
  • implementation of an associated web-based database (i.e. this site).

In 2015, NEA published an interim IFEP List (referred to as IFEP List 2.0). This internal list included:

  • information on the relevance of each FEP to the “performance and safety of the disposal system”; and
  • references and/or web-links to provide further information about each FEP.

The IFEP List 2.0 was developed in light of a review of various project-specific lists and databases, undertaken in 2012, and the resulting revisions to the structure of the IFEP List were subsequently approved by the NEA IGSC group.

In 2019, the interim IFEP List produced in 2015 was finalised and published as the IFEP List 3.0. This is the first version IFEP List to be hosted in the new web-based database (login).

Publications, reports